Check draft



April 26,1927:

M. ZILNTNER CHECK DRAFT Filed March 26. 1925 1 I {wa /9W [Ya/Z91? 292255.11

Patented Apr. 26, 1927.

warren stares PATENT orrics.

MATHEW ZENTNER, OF. OSHKOSH, WISGON$IN, ASBIGNOR TO TEELA SHEET IIIETAL 00., OF. OSHKOSH, WISCONSIN.

CHECK DRAFT.

Application filed March 26, 1925. Serial 11011.8,430.

This invention relates to a checkdraft.

In check drafts as heretofore constructed, it has been the universal practice to rivet or otherwise secure the check draft to the flue pipe. Then the flue pipe was removed, it was necessary to cut the rivets and remove the check draft from the pipe and, thereafter rerivet it to the new pipe.

This invention is designed to overcome the above noted defects, and objects of this invention are to provide a check draft which is removably clamped to a fine pipe in a manner to permit its ready and secure adjustment thereto, and also quick removal therefrom without requiring any riveting whatsoever to the pipe. 7

Further objects are to provide check draft damp-er which is so constructed that it may be adjusted to operate upon either a vertical or substantially horizontal pipe with the greatest ease, and which is formed of interlocking parts, whereby it may be clamped about the pipe and held thereon in the manner of a saddle.

An embodiment of the invention is shown in the accompanying drawings, in which Figure 1 is a side view of a portion of a flue pipe showing the check draft in position and partly in section.

Figure 2 is a face view of the structure shown in Figure 1 with a portion of the check draft broken away. I

Figure 3 is a transverse sectional view on the line 33 of Figure 2.

Referring to the drawings, it will be seen that the only thing necessary to adapt the pipe 1 for the reception of the damper is to cut a hole 2 through the pipe. It is not even necessary to turn up a flange or othe wise shape the margin of this hole; The check draft comprises a cylindrical portion 3 provided with a marginal flange 1. This flange 4 is curved to fit the pipe 1, as shown in the drawings, and is of sufficient width to provide an extensive bearing surface against the pipe. It is provided with a pair of spaced hooks 5 on opposite sides thereof which receive the transverse pins 6 of the clamping straps. These pins 6 are preferably formed integral with the enlarged portion 7 of the straps 8, such portion 7 merging into a strengthening web 9 of the straps. The straps are provided with opposed apertured ears 10 through which a clamping bolt 11 is adapted to be passed.

The cylindrical member 3 is provided with apertured ears 12 and 13 positioned at rightangles to each other, as shown in Figure 2. Either of these is adapted to cooperate with the spaced apertured ears 1 1 of the cover flap 15, a suitable pintle pin 16 being employed in the usual manner. This cover flap is provided with an upstanding eyelet portion or ear 17 adapted to receive the usual adjusting chain.

In applying the check draft it is merely necessary, as stated, to cut a hole 2 in the pipe 1. Thereafter, the device is positioned over the hole and the pins 6 of the straps 8 seated within the books 5. Thereafter the clamping bolt 11 is slipped through the ears 10 and the bolt is drawn tight, thus securely clamping the check draft in correct position with reference to the hole 2 of the pipe.

If it is desired to use the check draft on a horizontal pipe, it is merely necessary to pivot the ears 14; of the flap 15 to the upstanding lug 18, as shown in Figure 2.

In renewing the flue pipe, the check draft may be most readily removed from the old pipe and very readily applied to the new pipe.

It is to be noted that when an aperture is cut through a smoke pipe, the pipe is necessarily weakened at this point. Ordinarily, the pipe is strengthened by riveting the flange of the damper attachment to the pipe around the aperture. However, applicant secures this reenforcing of the pipe by providing the flanged damper attachment and the rigid ribbed clamping members which span the pipe and thus reenforce it by providing a structure consisting of three rigid and unyielding members which thus reenforce and brace the pipe.

It will be seen, therefore, that a check draft for fine pipes has been provided which is of simple and substantial construction, and which may be quickly attached to or detached from the flue pipe.

Although the invention has been described in considerable detail, it is to be understood that the invention may be variously embodied and is, therefore, to be limited only as claimed.

I claim:

The combination of a flue pipe having an aperture through its oyiindrioal Wall, and an attachment comprisinga cylindrical portion provided with an outwardly pro eeting Wide flanged portion curved to fit said pipev and extending completely around the cylindrical portion of said attachment, said attachment being positioned over the aperture in the pipe, a pair of outwardly opening hooks formed on opposite sides of the flanged portion, a pair of ribbed straps having laterally projecting pins carried at one end and adapted to engage said hooks and having apertured ears at the other end and a clamping bolt passing through the apertured ears of said straps, said flanged portion and said ribbed straps being rigid and serving to brace the pipe.

In tcstu'nony that I olann the foregoing I have hereunto .set my hand at Oshkosh, in

the county of Winnebago and State of Vis- 20 CODSHL MATHEXV ZENTNER. 

